Physics
Explainer: How do mass and weight differ?
Learn why these terms aren’t the same and which to use where. And should you report your results in kilograms? Pounds? If in doubt, try using newtons.
By Trisha Muro
MS-PS1-5
Develop and use a model to describe how the total number of atoms does not change in a chemical reaction and thus mass is conserved.
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Snot oozed by a marine tube worm can glow for up to 3 full days. The secret of how this works might lead to long-lasting lights that glow on and on.
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PlanetsPlanets with hydrogen skies could harbor life
Microbes can live in a hydrogen atmosphere. This points to new space worlds that host alien life.
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PhysicsClosing in on fusion energy
Scientists blasted a tiny capsule of hydrogen with laser beams, setting off a reaction that released more energy than in earlier experiments. Still, scientists remain a long way from creating a reaction that releases more energy than it needs to get started.